When comparing SlickEdit vs Aptana Studio, the Slant community recommends Aptana Studio for most people. In the question“What are the best JavaScript IDEs or editors?”Aptana Studio is ranked 29th while SlickEdit is ranked 32nd. The most important reason people chose Aptana Studio is:

Pro

Popular version control system

Pro

Available in standalone and Eclipse plugin versions

Pro

HTML5-aware code assist

Aptana's code assist displays which tags are supported by which browsers.

Pro

Support for web projects

Aptana was specifically created for web application development. It supports a variety of languages such as HTML, CSS, JavaScript, PHP, and Ruby.

Pro

Built-in terminal

Has a built-in terminal emulator from which you can run commands.

Pro

Free and open source

Aptana is available for free under the GPL license with source code available on GitHub.

Pro

Git integration

Aptana provides integrated support for Git to make collaboration and version control easier.

Cons

No cons yet!

Con

Many dependencies

Aptana has a couple of dependencies to keep in mind.It is built with Java and and has some requirements for the JDK version.Aptana requires Git, and Eclipse 3.5+ if you are installing it as an Eclipse plugin.